A naked eye visual acuity of 0.25 indicates poor vision and is considered severe vision loss. A visual acuity of 0.25 is far below normal vision, and a visual acuity of 1.0 and above is considered to be in the normal range. There are many reasons for vision loss, such as refractive errors, cataracts, glaucoma, and fundus lesions. Refractive errors include nearsightedness, farsightedness and astigmatism. If vision loss is caused by refractive errors, it can usually be diagnosed through optometry, and then vision can be corrected through prescription glasses or surgery under the guidance of a doctor. If the vision cannot reach the normal range after correction by optometry, it is necessary to consider whether there are other eye diseases, and further ophthalmologic examination is needed to improve the ophthalmologic specialty, according to the results of the examination and the doctor’s recommendation for the next step of treatment. If you have a visual acuity of 0.25, you should consult a doctor to find out the cause of the problem, and then take appropriate measures under the doctor’s guidance to avoid any delay in the treatment of your condition.